Where: Pernambuco, Brazil (7.5° S, 39.6° W: paleocoordinates 9.3° S, 8.2° W)
• coordinate stated in text
When: Romualdo Formation (Santana Group), Late/Upper Aptian to Late/Upper Aptian (122.5 - 109.0 Ma)
Environment/lithology: coastal; black shale and calcareous sandstone
• The Romualdo Formation rests unconformably on the underlying Ipubi and Crato formations, or as non-conformity on Precambrian crystalline basement, and the upper sequence boundary is a regional unconformity with the overlying alluvial deposits of the Exu and Araripina formations. Thickness: Up to a 100m thick. (Custodio et al., 2017; Rodriguez et al., 2020).
• The Romualdo Formation is constituted by a sequence of shale intercalated with sandstone at the base, followed by black shale with usually fossiliferous calcareous nodules, and layers of calcareous sandstone with macroinvertebrates. It also contains bony and cartilaginous fish, dinosaurs, pterosaurs, molluscs, echinoids, crustaceans, foraminifera, dinoflagellates, gymnosperms, and angiosperms. (Assine et al. 2014; Prado et al., 2018; Silva-Santos and Valença 1968; Mabessone and Tinoco 1973; Arai and Coimbra 1990; Berthou et al., 1990; Kellner 2002; Bruno and Hessel 2006; Lima et al., 2012; Pinheiro et al., 2014; Pereira et al. 2017).
Size class: macrofossils
Primary reference: L. A. C. Prado, J. Luque, A. M. F. Barreto and A. R. Palmer. 2018. New brachyuran crabs from the Aptian–Albian Romualdo Formation, Santana Group of Brazil: Evidence for a Tethyan connection to the Araripe Basin. Acta Palaeontologica Polonica 63(4):737-750 [J. Wolfe/A. Lynch]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 228641: authorized by Joanna Wolfe, entered by Arthur Lynch on 19.12.2022
Creative Commons license: CC BY (attribution)
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